CVE-2022-49763 (GCVE-0-2022-49763)
Vulnerability from cvelistv5
Published
2025-05-01 14:09
Modified
2026-08-05 08:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: fix use-after-free in ntfs_attr_find() Patch series "ntfs: fix bugs about Attribute", v2. This patchset fixes three bugs relative to Attribute in record: Patch 1 adds a sanity check to ensure that, attrs_offset field in first mft record loading from disk is within bounds. Patch 2 moves the ATTR_RECORD's bounds checking earlier, to avoid dereferencing ATTR_RECORD before checking this ATTR_RECORD is within bounds. Patch 3 adds an overflow checking to avoid possible forever loop in ntfs_attr_find(). Without patch 1 and patch 2, the kernel triggersa KASAN use-after-free detection as reported by Syzkaller. Although one of patch 1 or patch 2 can fix this, we still need both of them. Because patch 1 fixes the root cause, and patch 2 not only fixes the direct cause, but also fixes the potential out-of-bounds bug. This patch (of 3): Syzkaller reported use-after-free read as follows: ================================================================== BUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 Read of size 2 at addr ffff88807e352009 by task syz-executor153/3607 [...] Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597 ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193 ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845 ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854 mount_bdev+0x34d/0x410 fs/super.c:1400 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] </TASK> The buggy address belongs to the physical page: page:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350 head:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Kernel will loads $MFT/$DATA's first mft record in ntfs_read_inode_mount(). Yet the problem is that after loading, kernel doesn't check whether attrs_offset field is a valid value. To be more specific, if attrs_offset field is larger than bytes_allocated field, then it may trigger the out-of-bounds read bug(reported as use-after-free bug) in ntfs_attr_find(), when kernel tries to access the corresponding mft record's attribute. This patch solves it by adding the sanity check between attrs_offset field and bytes_allocated field, after loading the first mft record.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "79f3ac7dcd12c05b7539239a4c6fa229a50d786c",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "fb2004bafd1932e08d21ca604ee5844f2b7f212d",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "d0006d739738a658a9c29b438444259d9f71dfa0",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "266bd5306286316758e6246ea0345133427b0f62",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b825bfbbaafbe8da2037e3a778ad660c59f9e054",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5330c423b86263ac7883fef0260b9e2229cb531e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "4863f815463034f588a035cfd99cdca97a4f1069",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "d85a1bec8e8d552ab13163ca1874dcd82f3d1550",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.334",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.300",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.225",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.334",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.300",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.267",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.225",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.156",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.80",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.10",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix use-after-free in ntfs_attr_find()\n\nPatch series \"ntfs: fix bugs about Attribute\", v2.\n\nThis patchset fixes three bugs relative to Attribute in record:\n\nPatch 1 adds a sanity check to ensure that, attrs_offset field in first\nmft record loading from disk is within bounds.\n\nPatch 2 moves the ATTR_RECORD\u0027s bounds checking earlier, to avoid\ndereferencing ATTR_RECORD before checking this ATTR_RECORD is within\nbounds.\n\nPatch 3 adds an overflow checking to avoid possible forever loop in\nntfs_attr_find().\n\nWithout patch 1 and patch 2, the kernel triggersa KASAN use-after-free\ndetection as reported by Syzkaller.\n\nAlthough one of patch 1 or patch 2 can fix this, we still need both of\nthem.  Because patch 1 fixes the root cause, and patch 2 not only fixes\nthe direct cause, but also fixes the potential out-of-bounds bug.\n\n\nThis patch (of 3):\n\nSyzkaller reported use-after-free read as follows:\n==================================================================\nBUG: KASAN: use-after-free in ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\nRead of size 2 at addr ffff88807e352009 by task syz-executor153/3607\n\n[...]\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:317 [inline]\n print_report.cold+0x2ba/0x719 mm/kasan/report.c:433\n kasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n ntfs_attr_find+0xc02/0xce0 fs/ntfs/attrib.c:597\n ntfs_attr_lookup+0x1056/0x2070 fs/ntfs/attrib.c:1193\n ntfs_read_inode_mount+0x89a/0x2580 fs/ntfs/inode.c:1845\n ntfs_fill_super+0x1799/0x9320 fs/ntfs/super.c:2854\n mount_bdev+0x34d/0x410 fs/super.c:1400\n legacy_get_tree+0x105/0x220 fs/fs_context.c:610\n vfs_get_tree+0x89/0x2f0 fs/super.c:1530\n do_new_mount fs/namespace.c:3040 [inline]\n path_mount+0x1326/0x1e20 fs/namespace.c:3370\n do_mount fs/namespace.c:3383 [inline]\n __do_sys_mount fs/namespace.c:3591 [inline]\n __se_sys_mount fs/namespace.c:3568 [inline]\n __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n \u003c/TASK\u003e\n\nThe buggy address belongs to the physical page:\npage:ffffea0001f8d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e350\nhead:ffffea0001f8d400 order:3 compound_mapcount:0 compound_pincount:0\nflags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011842140\nraw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\nMemory state around the buggy address:\n ffff88807e351f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n ffff88807e351f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff88807e352000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                      ^\n ffff88807e352080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff88807e352100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\n\nKernel will loads $MFT/$DATA\u0027s first mft record in\nntfs_read_inode_mount().\n\nYet the problem is that after loading, kernel doesn\u0027t check whether\nattrs_offset field is a valid value.\n\nTo be more specific, if attrs_offset field is larger than bytes_allocated\nfield, then it may trigger the out-of-bounds read bug(reported as\nuse-after-free bug) in ntfs_attr_find(), when kernel tries to access the\ncorresponding mft record\u0027s attribute.\n\nThis patch solves it by adding the sanity check between attrs_offset field\nand bytes_allocated field, after loading the first mft record."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only by presenting a crafted NTFS volume to in-kernel fs/ntfs so mount runs ntfs_fill_super\u2192ntfs_read_inode_mount\u2192ntfs_attr_lookup\u2192ntfs_attr_fin d; this is a local block-device, loop, or USB/image path with no network protocol handler.\nAC:L - The attacker fully controls the on-disk $MFT record attrs_offset field, so setting it past bytes_allocated deterministically drives ntfs_attr_find into out-of-bounds/UAF reads with no race or other condition outside attacker control.\nPR:N - The attacker needs no account on the target\u2014the payload is solely a malicious NTFS image (USB stick, disk image, or media handed to udisks2/automount on desktops, kiosks, Android, or automotive systems), matching the established crafted-filesystem model.\nUI:R - Someone must mount the volume or insert media into a system that automounts it; classic ntfs is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so an unprivileged userns cannot mount it alone, and the PoC stack is in the mount task.\nS:U - The use-after-free/out-of-bounds accesses occur in host kernel memory within the same security authority as the mounting kernel; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN documents a use-after-free read in ntfs_attr_find when attrs_offset points past the allocated MFT buffer into freed/adjacent slab, and per UAF/OOB-read guidance this enables arbitrary kernel memory disclosure via heap reuse.\nI:H - The same OOB ATTR_RECORD pointer is consumed by mount paths (attribute-list size/allocation, memcpy, mapping-pairs decompress, runlist setup), and UAF/memory-corruption of that parse state is treated as enabling heap write and control-flow hijack primitives.\nA:H - The demonstrated KASAN use-after-free fault in ntfs_attr_find during mount can oops/panic the kernel, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:15.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/79f3ac7dcd12c05b7539239a4c6fa229a50d786c"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb2004bafd1932e08d21ca604ee5844f2b7f212d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0006d739738a658a9c29b438444259d9f71dfa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/266bd5306286316758e6246ea0345133427b0f62"
        },
        {
          "url": "https://git.kernel.org/stable/c/b825bfbbaafbe8da2037e3a778ad660c59f9e054"
        },
        {
          "url": "https://git.kernel.org/stable/c/5330c423b86263ac7883fef0260b9e2229cb531e"
        },
        {
          "url": "https://git.kernel.org/stable/c/4863f815463034f588a035cfd99cdca97a4f1069"
        },
        {
          "url": "https://git.kernel.org/stable/c/d85a1bec8e8d552ab13163ca1874dcd82f3d1550"
        }
      ],
      "title": "ntfs: fix use-after-free in ntfs_attr_find()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49763",
    "datePublished": "2025-05-01T14:09:03.607Z",
    "dateReserved": "2025-04-16T07:17:33.804Z",
    "dateUpdated": "2026-08-05T08:56:15.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.